1963: March on Washington for Jobs and Freedom
After months of organizing, on August 28th of 1963, a gathering of more than 200,000 people marched on Washington D.C. in what would become one of the most significant moments of the American Civil Rights Movement: The March on Washington for Jobs and Freedom.

Image sourced from NPR.org: https://www.npr.org/templates/story/story.php?storyId=129470920
It was at this march that Martin Luther King Jr. delivered his famous "I have a dream" speech at the Lincoln Memorial. This demonstration and the national response to it in part influenced the the passing of the Civil Rights Act of 1964, which ensured equal voting rights for non-white Americans and outlawed segregation.
Information sourced from: "March on Washington." Britannica Academic, Encyclopædia Britannica, 26 Aug. 2015. academic-eb-com.ezproxy.middlebury.edu/levels/collegiate/article/March-on-Washington/471029.